<template>
  <div >
    <h4 :style="{ marginBottom: '20px' }">{{ title }}</h4>
    <v-chart :force-fit="true" :onClick="handleClick" :height="height - 20" :data="data" :scale="scale">
      <v-tooltip/>
      <v-axis/>
      <v-legend/>
      <v-line :position="position" :color="this.yField?fields[0]:'x'"/>
      <v-point :position="position" :color="this.yField?fields[0]:'x'" :size="4" :v-style="style" :shape="'circle'"/>
    </v-chart>
  </div>
</template>

<script>
import { DataSet } from '@antv/data-set'
import { ChartEventMixins } from './mixins/ChartMixins'
export default {
  name: 'LineChartMultid',
  mixins: [ChartEventMixins],
  props: {
    title: {
      type: String,
      default: ''
    },
    dataSource: {
      type: Array,
      default: () => [
        { type: 'Jan', jeecg: 7.0, jeebt: 3.9 },
        { type: 'Feb', jeecg: 6.9, jeebt: 4.2 },
        { type: 'Mar', jeecg: 9.5, jeebt: 5.7 },
        { type: 'Apr', jeecg: 14.5, jeebt: 8.5 },
        { type: 'May', jeecg: 18.4, jeebt: 11.9 },
        { type: 'Jun', jeecg: 21.5, jeebt: 15.2 },
        { type: 'Jul', jeecg: 25.2, jeebt: 17.0 },
        { type: 'Aug', jeecg: 26.5, jeebt: 16.6 },
        { type: 'Sep', jeecg: 23.3, jeebt: 14.2 },
        { type: 'Oct', jeecg: 18.3, jeebt: 10.3 },
        { type: 'Nov', jeecg: 13.9, jeebt: 6.6 },
        { type: 'Dec', jeecg: 9.6, jeebt: 4.8 }
      ]
    },
    fields: {
      type: Array,
      default: () => ['jeecg', 'jeebt']
    },
    // 别名，需要的格式：[{field:'name',alias:'姓名'}, {field:'sex',alias:'性别'}]
    aliases: {
      type: Array,
      default: () => []
    },
    height: {
      type: Number,
      default: 254
    },
    xField: {
      type: String,
      default: 'type'
    },
    yField: {
      type: String,
      default: ''
    }
  },
  data() {
    return {
      scale: [{
        dataKey: 'x',
        min: 0,
        max: 1
      }],
      style: { stroke: '#fff', lineWidth: 1 },
      position: this.xField + '*' + (this.yField ? this.yField : 'y')
    }
  },
  computed: {
    data() {
      if (this.yField) {
        return this.dataSource
      }
      const dv = new DataSet.View().source(this.dataSource)
      dv.transform({
        type: 'fold',
        fields: this.fields,
        key: 'x',
        value: 'y'
      })
      const rows = dv.rows
      // 替换别名
      rows.forEach(row => {
        for (const item of this.aliases) {
          if (item.field === row.x) {
            row.x = item.alias
            break
          }
        }
      })
      console.log(rows)
      return rows
    }
  }
}
</script>

<style scoped>

</style>
